Date:
May 17, 2021
Issue #:
1624
Summary:
Lyme disease in the US is caused by the spirochete
Borrelia burgdorferi, which is transmitted to humans
by Ixodes scapularis (blacklegged [deer] tick) and
I. pacificus (western blacklegged tick). Most cases of
Lyme disease occur in late spring and early summer
in northeastern and mid-Atlantic states, the upper
Midwest, and in northern California. B. mayonii, which
is also transmitted by I. scapularis, has been shown to
cause a similar illness in the upper Midwest.
Borrelia burgdorferi, which is transmitted to humans
by Ixodes scapularis (blacklegged [deer] tick) and
I. pacificus (western blacklegged tick). Most cases of
Lyme disease occur in late spring and early summer
in northeastern and mid-Atlantic states, the upper
Midwest, and in northern California. B. mayonii, which
is also transmitted by I. scapularis, has been shown to
cause a similar illness in the upper Midwest.
